what variables carry extended axis values

I've got (2) extended axis (J7 & J8) that I make a dual axis after I calibrate them (J8 follows J7) so after pairing, a PR will only show J1-J7, I've noticed that if J8 (or J7) suffers a over current fault (requiring the controller to be power cycled) and J8 is no longer zero when J7 is zero, there are no faults indicating that they are no longer synchronized. So, on power up I'd like to put a comparison check on the J7 & J8, and report the un-synchronoused condition. Any place in the system variables I can get J8 value? (Sorry if this is detailed in another thread, a quick search didn't yield anything).

Thanks, Jeff

Sadly, $scr_grp.$mch_ang doesn't give me the value of the slaved axis, only the master (J7 updates but J8 does not). I scoured the $DUAL_DRIVE variables where the master/slave relationship is defined but no luck there either.

Quote from dha

You can use

Code

$SV_INFO[1].$AXIS_POS[7]
$SV_INFO[1].$AXIS_POS[8]

Thank you, I'll give that a look. -Jeff